(12) United States Patent (10) Patent No.: US 8,209,927 B2 Cottier Et Al
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US008209927B2 (12) United States Patent (10) Patent No.: US 8,209,927 B2 Cottier et al. (45) Date of Patent: Jul. 3, 2012 (54) STRUCTURAL FIBER CEMENT BUILDING 37.2%J. w A 8. 3. itygeberg et al.1 MATERLALS 2,377,484 A 6, 1945 Elmendof 2,676,892 A 4, 1954 McLaughlin (75) Inventors: John Sydney Cottier, Oatley (AU); 2,797,201 A 6, 1957 Veatch December Rose Cowen, Yucaipa, CA 2.978,340 A 4, 1961 Veatch et al. (US); Remi Dunoyer, Randwick (AU); 39. A 233 Malik Steven Duselis, Baulkham Hills (AU); 3.264,135 A 8, 1966 Sin James Albert Gleeson, North Curl Curl 3.35 14 14 A 5, 1967 Veli (AU); Amitabha Kumar, Claremont, 3,360,392 A 12/1967 Modet al. CA (US) 3,365,315. A 1/1968 Becket al. 3,501,324 A 3, 1970 Kubo ck (73) Assignee: James Hardie Technology Limited, SE A 3229 East . 52,125.5 Dublin (IE) 3,748,100 A 7, 1973 ForSeth (*) Notice: Subject to any disclaimer, the term of this (Continued) patent is extended or adjusted under 35 FOREIGN PATENT DOCUMENTS U.S.C. 154(b) by 928 days. AR 2O6788 A1 8/1976 (21) Appl. No.: 11/961,749 (Continued) (22) Filed: Dec. 20, 2007 OTHER PUBLICATIONS O O Skaggs, C.B. et al "Applications of Rheological Modifiers and (65) Prior Publication Data Superplasticizers in Cementitious System” American Concrete Insti US 2009/0162602 A1 Jun. 25, 2009 tute SP (1994), SP-148, 189-207. (Continued) (51) Int. Cl. E04C I/00 (2006.01) Primary Examiner — Basil Katcheves (52) U.S. Cl. ...................................... 52/309.3: 52/125.5 (74) Attorney, Agent, or Firm — Knobbe, Martens, Olson & (58) Field of Classification Search ................. 52/309.3, Bear, LLP 52/125.5; 428/192 See application file for complete search history. (57) ABSTRACT (56) References Cited A structural fiber cement sheet containing cementitious matrix and reinforcing cellulose fibers distributed throughout U.S. PATENT DOCUMENTS the matrix having a dry density less than 1.25 g/cm, a thick ness less than 0.7500 in, and able to withstand uniform loads 815,801 A 3, 1906 Depew etal. of 200 psfor greater according to test method of Section 1,571,048 A 1, 1926 Garrow 1914, 163 A 6, 1933 Randall 6.4.2.4 of PS2 and with a deflection of less than 0.067 inches 2,156,308 A 5, 1939 Schuh at 60 psfwhen spaced on a span of 24 inches or less on center. 2,156,311 A 5, 1939 Schuh 2,175,568 A 10, 1939 Haustein 7 Claims, 7 Drawing Sheets US 8,209,927 B2 Page 2 U.S. PATENT DOCUMENTS 4,403,006 9, 1983 Bruce et al. 4.406,703 9, 1983 Guthrie et al. 3,748,160 7, 1973 Carbajal 4411,723 10, 1983 Takeuchi 3,752,685 8, 1973 Honda et al. 4411,847 10, 1983 Netting et al. 3,753,749 8, 1973 Nutt 4,428,775 1, 1984 Johnson et al. 3,782,985 1, 1974 Gebhardt 4,430, 108 2, 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